Improved conical-turning gage



UNITED STATES PATENT OFFICE.

MILTON BOWKER, OF FITGHBURG, MASSACHUSETTS.

IMPROVED CONICAL-TURNING GAGE.

Specification forming part of Letters Patent No. 49,073, dated August 1,1865.

To all whom 'it may concern:

Beit known that I, MILTON BoWKEa, of Fitchburg, in the county ofWorcester and State of Massachusetts, have invented a new and usefultool, which I term a Conical-Turning Gage,77 for enabling an operator toadjust a piece of iron or other material in an enginelathe at thedesired angle, so as to give the exact amount of taper required to acertain number of inches in length in a cone or conic section withoutmaking any calculations or experiments; and I do hereby declare that thefollowing is a clear and exact description thereof, reference being hadto the accompanying drawings and the letters of reference markedthereon, in which- Figure l is afront view; Fig. 2, a side View; Fig,afront view with the dial-plate removed; Fig. 4, a sectional side viewcut through the center, as indicated by red line in Fig. 3.

The process of turning iron or other metal conical or tapering in anengine-lathe is one that requires considerable calculation, care, andrepeated trials, especially when the taper is to be made to fit acorresponding socket or hole. In order to obviate this difficulty I haveendeavored to construct a tool in such a manner that the taper may bedetermined and turned without any calculation and very little, if any,experimenting or trials.

Having thus far' premised, I will now proceed to describe theconstruction and operation of my invention, in order that others skilledin the art may be able to make and use the same.

In the drawings, A is the stock or body of the tool, with a shank,fA/,to be inserted in the tool-stock of au en gine-lathe.

B is whatI term the dial-plate7 or index, having two circular graduatedlines, one within another, both being nearly concentric with thecircumference of the dial-plate, 'the outer one divided intoone-hundredths and the inner one into sixty-fourths parts of aninch,either circle being susceptible of more minute divisions, if

necessary.

C is a small'arbor or shaft carrying a pinion, into which the rack ofthe self-adjusting bar D plays, so as to cause it to rotate back andforth as the bar is moved in and out of the stock, as will behereinafter more fully described.

E is a hand with two pointers, attached to the outer end of the arbor Cin such a manner as to register minutely upon the graduated circles theexact distance that the self-adjusting bnr is moved in and out as thefrictionroller G in the end of the self-adjusting bar D is traversedback and forth upon a straight shaft, the same being placed upon thecenterpoints of a lathe and set over to an angle that shall representthe taper to be turned.

F is a scroll-spring attached to the pinion C, and also to a pin in thestock, as shown at K in Figs. 3 and 4, to keep the self-adjusting bar Dconstantly thrown out.

G is a small friction-roller with either a concave,.convex, or fiatperiphery, which is designed to travel against the surface of a straightshaft adjusted upon the centerpoints of a lathe at such an angle asshall represent the taper which it is desired to obtain.

His a check-pin placed in the aperture in the stock A, through which theself-adjusting bar D plays, and passing up into a slot in theselfadjusting bar D, so as to prevent its being thrown out too far bythe action ofthe spring F.

Having thus fully described my invention, I will now proceed to explainits use and application.

When it is necessary to iind any taper to a certain number of inches inlength the shank of the gage or tool is inserted inthe tool-stock of thelathe. A straight shaft or arbor with a uniform diameter is thenadjusted upon the center-points of the lathe. The tail-stock carryin gthe dead-center is then set over, either to or from the tool, as thecase may require,

so that when the tool is traversed back and forth upon the surface ofthe shaft or arbor the distance to which the taper is to be turned bymoving the slide-rest of the lathe it shall force in the self-adjustingbar D, thereby rotating the shaft C, carrying the hand with the pointersE sufficiently to indicate the exact taper required. Then the shaft orarbor is removed from the center-points of the lathe and the iron or anyother metal ormatcria-l upon which the taper is to be turned is affixedin its place. The operator may then proceed to turn the taper, whichwill be found sufficiently exact so that it may be readily brought to aperfect tit with the file.

WhatvI olaiin as my invention, and desire to and for the purpose hereindescribed and set secure by Letters Patent, is-V forth.

A combination Composed ofthe self-adj usting bar D, the pinion and arborC, the fricbion- MILTON BOWKER' roller G, the scroll-spring F, thecheck-pin H, Witnesses: the hand E, and the dial-plate B, the Whole 0.H. B. SNOW,`

being` arranged substantially in the manner] SYLVANUS SAUZER. V*

